Dynamo-electric machine.



0. GREEN. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED AUG. 12,1903.

905,512. imiefited. Dec. 1,19%.

Inventor Charles M, C sheem,

UNITED CHARLES M. GREEN,

C E Lii."i ll Z, MASSACHUSETTS, ASSlGNOR TO GENERAL ELECTRIC COliiPANY, A CORPORATION OF NEW YORK.

DYNAIVIO-ELEGT31C. MACHINE.

Snecificabion of Letters Patent.

Patented Dec. 1, 1968* Apolication filed August 12, 1903. Serial No. 169,178.

citizen of vthe United States, residing at.

Lynn county of Essex. State of Iviassachw setts, have invented certain new and useful ln'iproveinents in Dynaino-ifllectiic Ilia chi 'ies, of which the iollowing is a specifi- 'CaUOfl. j I The object of my present invention is to improve the construction of dynamo-electric machines. V

More particularly my invention relates to constant. current generators ,oi the weil known type called Brush machines 0?: Brush arc light machines though of the titres of my invention not iii'nitecl suchiuachin'es. My invention consists cectain novel features of construction and arrangement which will be pointed out in the claims onnexed to and forming a part oi this specification. I For a hotter understanding of my inven- ..tion reference may .he had to the accompany ing drawings in which 1 have illustrated one embodinientof my invention;

Of the drawings l 'ure 1 is a perspective view of a dynai'no-eleclric machine in which i my invention is embodied; F 2 is a sectional elevation of the armature; Fig. 3 is an elevation showing details of the armature and shield: Fig. 1: is a developed view of the armature shield Fig. 5 is a section taken on line 6'43 ofFig. ti; and Fig. 6 is a view showing the way in which the material for the shield is cut from stock.

in the particular form of my invention which I have illustrated in the drawings, 1 have shown a dyna1i1()--"lect1'ic machine known as the Brush machine.

Referring to the drawings. 1 represents a base of suitable construction on which, the generator fran'ie 2 proper is udjustably mounted. Bearing blocks 5 and 6 carried byienil portions 3 and l of the frame! support suitable hearings in which the tubular shaft 7 is mounted. This shaft carries at one end suitable cou'nnutator members 8 and at the other end a power-receiving pulley 9. The shaft also carries intermediate its ends an armature 10 which revolves hctween pole l pieces 11 which project inwardly from the upper extensions 3 and 4 of the Tmmc I make no claim in the present application to the construction of the pole pieces. 'ihese pole pieces form the subject matter of application bio-rial So. 23l,d-i9,iiled by me on the 8th day of iiOWilniK-Pl, 190i. 118 a divi sion of this application.

The a atui'e .10 comprises a ring 12 formed of lan'iinatecl magnetic material provided at intervals with laterally pi'ojeciing portions 13 of magnetic material. The laterally pro jecting portions 1;) are formed of pieces or laminae of magnetic n'iaterial WlliCll one interleaved with the laminacomposiw' the ring as shown i Ci" lai'ninae are so urcd their in any The ring is .1

ried e. nuh .L.

secure the r Coi he no two of suitable 1: oute ouler periphem portion and shown in Figs.

"the guard or shield is made is cut on the bias preferably at an angle of 45 to the direc tion of the ilil'tdNlS as indictted in Fig. (3 where 19 represents a strip of stool; from which sections it? are cut. The edges of the guard are folded hack and secured to the body of the guard in a suitable manner as by a line of stitching e1. in such nnlnner as to 'lcavc pool or channels "2 at each side of the guai'n i each which cords 21-} placed. i ..id i 'i hcn the guard or shield is placed upon the armature the ends of the cords 93 are drawn tightly together and coni'iecti-c. This makes the edges of the shield shorter than the hody and pulls the 1rd or shield into the shape clearly shown in Fi s. 1, 2 and 3, in which the shield closely braces the curved ends of the coils. By season ofthe n' nnner in which the canvas is out, the shield will he stretched perfectly taut. With the smooth outer surface obtained under these circun l'l surround t i o ojccl: beyond stances the air causes considerably less' resistance to the motion of the machinery- When it is rotated at a high speed than when the shield is omitted. The ends of the strip forming the shield may be secured together before or after the edges of the shield are drawn into place. The spaces left between the coils insure a 00d ventilation of the armature. In practice I prefer to size and shellac the shield after it is' placed in position. I

I have chosen to illustrate my invention in connection with the armature of a Brush machine, but it is evident to those skilled in the art that my invention may be applied to any member of any type of dynamo-electricmachine, and I aim in the appended claims to cover all modifications which do not depart from the spirit of my invention.

That I claim as new and desire to secure by Letters Patent of the United States, is,

1. In a dynamo-electric machine, an armature having an irregular outline, and a selfcontained shield therefor made of a strip of flexible Woven fabric and means carried by the fabric for causing the shield to closely embrace the armature.

2. In a dynamo-electric machine, an armature having an irregular outline, a shield therefor in the form of a strip offlexible material surrounding said armature, and means for shortening the edges of said strip to cause said strip to tightly embrace the armature.

3. In a dynamo-electric machine, an armature and a strip of flexible material having 5. In a dynamo-electric machine, a memher, a shield therefor formed out of flexible material, and means for gathering the edges of said shield to cause theshield to closely embrace the member.

6. In a dynamo-electric machine, a member, a shield therefor formed out of woven fabric cut on the bias, and means for gathering the edges of said shield to cause the shield to closely embrace said member.

In Witness whereof, I have hereunto set my hand this seventh day of August, 1903.

CHARLES M. GREEN.

Witnesses:

DUGALD McK. MOK LLoP, CHATTIN BRADWAY. 

